diff --git a/pyproject.toml b/pyproject.toml
index 407c78f4..975eb78f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ classifiers = [
 ]
 requires-python = ">=3.9"
 dependencies = [
-    "bumps>=1.0.0a4",
+    "bumps>=1.0.0a6",
     "matplotlib",
     "numba",
     "numpy",